Arthur bergh satterlee



(No Model.)

A. B. SATTERLEE.

SUN DIAL.

Patented Sept. 9, 1890. i:

A TTORNEY.

UNITED STATES PATENT OFFICE.

ARTHUR BERGH SATTERLEE, OF NEVV" YORK, N. Y.

SUN-

DIAL.

SPECIFICATION formng part of Letters Patent No. 436,153, dated September9,1890.

Application filed January 25, 1890. Serial No. 338,152. (No model.)

To all whom it may concel'n:

Be it known that I, ARTHUR BERGH SAT- TERLEE, a citizen of the UnitedStates, residngin the city, county, and State of New York, have inventeda new and useful Improvement in Sun-Dials, of which the following is aspecification.

My invention relates to an improvement in sun-dials, the object of thesame being to pro- Vide a device for telling the time by the sun. Afurther object is to provide a device of the above character which willbe simple and economic-al in construction and durable and efficient inuse; and with these ends in view my invention consists in the certainfeatures of construction and combinations of parts, as Will behereinafter fully described, and pointed out in the claim.

In the accompanying drawings, Figures 1 and 2 represent the twosemicircles, each made with an isosceles triangle attached forming thestyle and having the angles `A D O equal to t-he latitude of the placein which it is intended that the sun-dial shall be sold. Fig. 3 showsthe bottom plate with two lines intersecting in the center of thecircle. Fig. 4 is the box with the top thereon, showing the bar securedto the top and the dial suspended therefrom.

Any known formula may be used to determine the correct hour and minutelines. The formula employed in this instance may be found inTrautwi'ncis Engineers Pocket- Boolc, series of 1883, under the head ofDialing, pages 150, 151.

In the drawings, the lines A A represent the true north and south lines,the east and west lines being designated by the letters E and l/V. Thedial, as shown, is intended to designate hours, half-hours, andquarterhours.

The bottom plate (shown in Fig. 3) having two lines a intersecting inthe center of the circle, is so arranged that the angle at which thelines are drawn is equal to the magnetic Variation of the place in whichthe dial is to be used.

The style b is formed in two sections, the triangular portions c of eachbeing bent at right angles t-o the face of the dial. The parts c arepasted together, so that the style will form a complete circle. Theupper end of the triangle is provided with the circle d, formed directlyin the center thereof and of the dial, so that the lines willcoincidethroughout. A needle 8 is inserted between vthe two sections ofthe style forming the top, so that the point will be in the center ofthe circle d and directly on the east and west line, the prolongation ofwhich is on the style.

The bottom plate (shown in Fig'. 3) has two lines intersecting in thecenter of the circle. The angle at which these lines are drawn is equalto the magnetic Variation of the place in which the dial is to be used.This plate is pasted on the dial, so that one of the lines will be on aline with the style as the Variation of the magnetic needle may be eastor west.

The angles a' c' f and D' c' c' are equal to the magnetic Variation.Suppose the angle a' e' is on line with the style. The compassneedle His pasted on the line f' D', thus making the correction for magneticVariation. The dip of the needle is corrected by sliding the needlebackward or forward on the line f' D' before the mucilage has hardened.The finishing-plate h is then paste'd over the bottom plate and theneedle.

The dial complete is inclosed in a round pasteboard box. The top of thebox has a line j 70 drawn through the center of the circle. The top ofthe box is provided with the perforation l in the side thereof toreceive the brass piece m, which enters therein at one end of the line j70 and upon 'which is suspended the dial, as shown in Fig. 4.

I-Iaving descrbed the construction of the dial, I will describe theoperation thereof. The dial should be placed in the direct rays of thesun with the top on the box. The bar m is then inserted in theperforation Z with the needle-point of the dial resting thereon. Whensteady, the east and west line on the dialA should be nearly parallel'with the bar. When the dial is quiet, the time may be read by theshadow. p

v I-Iaving fully described my invention, what I claim as new, and desireto secure 'by Letters Patent, is-

IOO

In testimony whereof I have aflixed my signature in presence of twoWltnesses.

ARTHUR BERGH SATTERLEE.

Vitnesses:

THOMAS F. MURRAY, LONTINE L. N. SATTERLEE.

